You have to keep on learning if you want to keep ______ with the development of modern science and technology.

He was so excited and insisted that what he had done completely______ their demand（要求）.

A society cannot be successful if it throws tradition away，but it cannot be successful ________ if we do something to stop progress.                                

----Did you look up the time of the high-speed trains to Shanghai?----Yes, the early train is __________ to leave at 5:30 a.m.

 I invited Joe and Linda to dinner，but ________ of them came.